One Yankee fantasized about how good Toronto ace Roy Halladay would look in pinstripes. Others asked what the chances were of baseball’s best right-hander landing in The Bronx.

With Chien-Ming Wang out indefinitely with a shoulder problem and Alfredo Aceves, yesterday’s starter in the Yankees’ 6-4 series-sweeping victory over the Twins, better suited as a reliever, the Bombers need a starter even though they moved into a tie for first place in the AL East as a result of Boston’s 8-6 loss last night to the Royals.

Toronto GM J.P. Ricciardi earlier this week said he’s willing to listen to trade offers. Yankee GM Brian Cashman has refused to comment but surely is monitoring the situation. Meanwhile, The Post’s Joel Sherman reported the Phillies are viewed as the frontrunners for the five-time All-Star.

Since Toronto is open to offers, Yankee players have asked: “Why not us?”

As of yesterday the Blue Jays hadn’t delivered anything concrete to Halladay, who has a little less than $7 million remaining this year and $15.75 million next season after which he can become a free agent. Since he has a no-trade clause, Halladay has the option of demanding a contract extension to accept a trade.

As for Aceves, his first start of the year was up and down.

“He gave up a 0-2 homer [to Jason Kubel] and walked the next go so I think it affected him,” manager Joe Girardi said of Aceves, who gave up four runs (three earned) and four hits in 3 1/3 innings.

Had Aceves been available in relief yesterday Girardi wouldn’t have had to call on David Robertson in the fourth with the bases loaded and try to patch it through with Robertson and Jonathan Albaladejo in the middle innings.

Robertson issued three walks — two with the bases loaded. Staked to a 3-0 lead against Francisco Liriano in the second when all the runs were unearned, Aceves gave back two in the home half on Kubel’s homer and Cody Ransom’s throwing error.

The two runs the Yankees scored in the fourth on RBI singles from Ransom and Brett Gardner were matched quickly when Robertson issued two bases-loaded walks.

“I did a terrible job today,” said Robertson, whose roster spot could be in jeopardy today if the Yankees believe bullpen help is necessary after using five relievers yesterday.

“I was missing with my fastball and I wasn’t throwing strikes.”

Robertson did get AL batting race leader Joe Mauer to ground out and leave three on with an inside curveball.

Mark Teixeira’s first homer in 95 at-bats upped the Yankees’ lead to 6-4 in the fifth.

Albaladejo (4-1) started to restore order and Phil Coke and Hughes got the game to Mariano Rivera, who recorded the final three outs for his 23rd save in 24 chances.

The Yankees’ 13th win in 15 games also ended their season series with the Twins with a 7-0 ledger.

After Rivera gave up a two-out single to Brendan Harris in the ninth, he had to face Mauer.

“I don’t like to see Mauer against anybody,” Derek Jeter said.

“In, in and away,” Rivera said of his approach that resulted in Mauer grounding a 0-2 pitch to Teixeira for the final out. “I didn’t want him to extend.”

As they dressed for a plane to California, a player asked: “Are we in the Halladay thing? What will it take?” The answer to the first question is always, “Yes.” The answer to the second one is “a lot.”